Wireless Information and Power Transfer in Full-Duplex Systems with Massive Antenna Arrays

摘要

We consider a multiuser wireless system with a full-duplex hybrid accesspoint (HAP) that transmits to a set of users in the downlink channel, whilereceiving data from a set of energy-constrained sensors in the uplink channel.We assume that the HAP is equipped with a massive antenna array, while allusers and sensor nodes have a single antenna. We adopt a time-switchingprotocol where in the first phase, sensors are powered through wireless energytransfer from HAP and HAP estimates the downlink channel of the users. In thesecond phase, sensors use the harvested energy to transmit to the HAP. Thedownlink-uplink sum-rate region is obtained by solving downlink sum-ratemaximization problem under a constraint on uplink sum-rate. Moreover, assumingperfect and imperfect channel state information, we derive expressions for theachievable uplink and downlink rates in the large-antenna limit and approximateresults that hold for any finite number of antennas. Based on these analyticalresults, we obtain the power-scaling law and analyze the effect of the numberof antennas on the cancellation of intra-user interference and theself-interference.